吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1894-1903.doi: 10.13278/j.cnki.jjuese.201706306
卢燕红, 吴兆营, 丁广, 付琦, 张帆
Lu Yanhong, Wu Zhaoying, Ding Guang, Fu Qi, Zhang Fan
摘要： 为了更好地研究吉林前郭地区的地震活动性，本文利用2013年10月至2015年2月吉林前郭5.8级震群周围17个地震台站记录到的405个地震事件资料，共获得2 218条P波走时数据和2 166条S波走时数据，采用地震双差层析成像技术，获取吉林前郭震区上地壳三维P波、S波速度精细结构。结果显示，震区上地壳速度分层明显，P波速度变化范围为5.8~7.2 km/s，S波速度变化范围为3.4~4.0 km/s，波速比（vP/vS）变化较小。震区有低速带穿过，低速带走向为北东向，倾角较大（近直立），纵向延伸至15 km深度；震群主要位于低P波和S波速度区，对应较低的波速比。吉林前郭震区构造强度较低，受西太平洋板块俯冲产生应力场的影响，易于发生地震。
中图分类号:
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